fix for ExampleTrait.Example equality

[lewisjkl]

Description of changes:

Found this issue through:

val modelString =
  """|$version: "2"
     |
     |namespace foo
     |
     |@examples([
     |  {
     |    title: "Test This"
     |    input: {
     |      test: "something"
     |    }
     |  }
     |])
     |operation Foo {
     |  input := {
     |    test: String
     |  }
     |}
     |""".stripMargin

val one = Model
  .assembler()
  .addUnparsedModel("foo.smithy", modelString)
  .assemble()
  .unwrap()
val two = Model
  .assembler()
  .addUnparsedModel("foo.smithy", modelString)
  .assemble()
  .unwrap()

one == two // false

I've allowed edits from maintainers, feel free to change as you see fit or tell me what to change.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

YES

[lewisjkl]

Sorry for the noise, I should have checked prior to pushing rather than assume there wouldn't be more issues.. This time, ./gradlew :smithy-model:checkstyleMain succeeded locally with no issues.